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【单选题】

______________ airplane is faster than ______________ train.

[ ]

A.
an; a
B.
An; a
C.
a; a
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参考解析:
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举一反三

【单选题】---what's your sister doing?----_________.[ ]

A.
She sings
B.
She often watches TV
C.
She's singing
D.
I am singing